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415 ILCS 120/20

    (415 ILCS 120/20)
    Sec. 20. Rules. Rules implementing Section 30 of this Act shall include, but are not limited to, calculation of fuel cost differential rebates and designation of acceptable conversion and OEM technologies.
    In designating acceptable conversion or OEM technologies, the Agency shall favor, when available, technology that is in compliance with the federal Clean Air Act Amendments of 1990 and applicable implementing federal regulations. Conversion and OEM technologies that demonstrate emission reduction capabilities that meet or exceed emission standards applicable for the vehicle's model year and weight class shall be acceptable. Standards requiring proper installation of approved conversion technologies shall be included in the recommended rules.
    Notwithstanding the above, engines used in alternate fuel vehicles greater than 8500 pounds GVWR, whether new or remanufactured, shall meet the appropriate United States Environmental Protection Agency emissions standards at the time of manufacture, and if converted, shall meet the standards in effect at the time of conversion.
(Source: P.A. 90-726, eff. 8-7-98; 91-798, eff. 7-9-00.)